1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "keycaches.h"
/****************************************************************************
Named list handling
****************************************************************************/
NAMED_ILIST key_caches;
/**
ilink (intrusive list element) with a name
*/
class NAMED_ILINK :public ilink
{
public:
const char *name;
uint name_length;
uchar* data;
NAMED_ILINK(I_List<NAMED_ILINK> *links, const char *name_arg,
uint name_length_arg, uchar* data_arg)
:name_length(name_length_arg), data(data_arg)
{
name= my_strndup(name_arg, name_length, MYF(MY_WME));
links->push_back(this);
}
inline bool cmp(const char *name_cmp, uint length)
{
return length == name_length && !memcmp(name, name_cmp, length);
}
~NAMED_ILINK()
{
my_free((void *) name);
}
};
uchar* find_named(I_List<NAMED_ILINK> *list, const char *name, uint length,
NAMED_ILINK **found)
{
I_List_iterator<NAMED_ILINK> it(*list);
NAMED_ILINK *element;
while ((element= it++))
{
if (element->cmp(name, length))
{
if (found)
*found= element;
return element->data;
}
}
return 0;
}
void NAMED_ILIST::delete_elements(void (*free_element)(const char *name, uchar*))
{
NAMED_ILINK *element;
DBUG_ENTER("NAMED_ILIST::delete_elements");
while ((element= get()))
{
(*free_element)(element->name, element->data);
delete element;
}
DBUG_VOID_RETURN;
}
/* Key cache functions */
LEX_STRING default_key_cache_base= {C_STRING_WITH_LEN("default")};
KEY_CACHE zero_key_cache; ///< @@nonexistent_cache.param->value_ptr() points here
KEY_CACHE *get_key_cache(LEX_STRING *cache_name)
{
if (!cache_name || ! cache_name->length)
cache_name= &default_key_cache_base;
return ((KEY_CACHE*) find_named(&key_caches,
cache_name->str, cache_name->length, 0));
}
KEY_CACHE *create_key_cache(const char *name, uint length)
{
KEY_CACHE *key_cache;
DBUG_ENTER("create_key_cache");
DBUG_PRINT("enter",("name: %.*s", length, name));
if ((key_cache= (KEY_CACHE*) my_malloc(sizeof(KEY_CACHE),
MYF(MY_ZEROFILL | MY_WME))))
{
if (!new NAMED_ILINK(&key_caches, name, length, (uchar*) key_cache))
{
my_free(key_cache);
key_cache= 0;
}
else
{
/*
Set default values for a key cache
The values in dflt_key_cache_var is set by my_getopt() at startup
We don't set 'buff_size' as this is used to enable the key cache
*/
key_cache->param_block_size= dflt_key_cache_var.param_block_size;
key_cache->param_division_limit= dflt_key_cache_var.param_division_limit;
key_cache->param_age_threshold= dflt_key_cache_var.param_age_threshold;
}
}
DBUG_RETURN(key_cache);
}
KEY_CACHE *get_or_create_key_cache(const char *name, uint length)
{
LEX_STRING key_cache_name;
KEY_CACHE *key_cache;
key_cache_name.str= (char *) name;
key_cache_name.length= length;
if (!(key_cache= get_key_cache(&key_cache_name)))
key_cache= create_key_cache(name, length);
return key_cache;
}
void free_key_cache(const char *name, KEY_CACHE *key_cache)
{
end_key_cache(key_cache, 1); // Can never fail
my_free(key_cache);
}
bool process_key_caches(process_key_cache_t func)
{
I_List_iterator<NAMED_ILINK> it(key_caches);
NAMED_ILINK *element;
while ((element= it++))
{
KEY_CACHE *key_cache= (KEY_CACHE *) element->data;
func(element->name, key_cache);
}
return 0;
}
#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
template class I_List_iterator<NAMED_ILINK>;
#endif
|
